Question

我尝试做一个简单的小部件来启动外部应用程序（例如：Twitter）
我想使用Toast消息，如果使用ActivityNotFoundException找不到应用，但Toast不起作用。这是我在onUpdated内的代码。

try {
    // Create an Intent to launch Twitter
    Intent intent3 = new Intent();

    ComponentName cn3 = new ComponentName("com.twitter.android",
        "com.twitter.android.MainActivity");
    intent3.setComponent(cn3);

    PendingIntent pending3 = PendingIntent.getActivity(context, 0,
    intent3, 0);

    RemoteViews views3 = new RemoteViews(context.getPackageName(), R.layout.activity_main);
    views.setOnClickPendingIntent(R.id.imageView3, pending3);

    appWidgetManager.updateAppWidget(currentWidgetId, views3);
} catch (ActivityNotFoundException e) {
    Toast.makeText(context, "Twitter not installed", Toast.LENGTH_LONG).show();
}

Answer 1

尝试：

Toast.makeText(getApplicationContext(), "Twitter not installed", Toast.LENGTH_LONG).show();

Answer 2

public class MyWidgetProvider extends AppWidgetProvider {

    private static String WIDGET_CLICKED = "widget_clicked";

    @Override
    public void onUpdate(Context context, AppWidgetManager  appWidgetManager, int[] appWidgetIds) {
        for (int appWidgetId : appWidgetIds) {

            Intent intent = new Intent(context, MyWidgetProvider.class);
            intent.setAction(WIDGET_CLICKED);

            PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
            RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.my_widget);
            views.setOnClickPendingIntent(R.id.example_widget_button, pendingIntent);

            appWidgetManager.updateAppWidget(appWidgetId, views);
        }
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        super.onReceive(context, intent);

        if (intent.getAction().equals(WIDGET_CLICKED)) {
            try {
                Intent twitterIntent = new Intent(Intent.ACTION_MAIN);
                twitterIntent.setClassName("com.twitter.android", "com.twitter.android.MainActivity");
                twitterIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(twitterIntent);
            } catch(ActivityNotFoundException e) {
                Toast.makeText(context, "Twitter not installed", Toast.LENGTH_LONG).show();
            }
        }
    }
}

从Widget启动Activity并捕获ActivityNotFoundException

2 个答案: